Context switching really is a huge hassle which is why I absolutely abhor email logins. We as user have become privileged with high speed interactions on the we

Context switching really is a huge hassle which is why I absolutely abhor email logins. We as user have become privileged with high speed interactions on the web and any hit to it will definitely have an effect on user retention. Also keep in mind that most internet services are bottlenecked by network latency. When asking a user to login with email it adds in the time the user takes to physically navigate through the pages of the email client and the 'n' network requests needed to open an email and follow a link. See https://www2.deloitte.com/content/dam/Deloitte/ie/Documents/Consulting/Milliseconds_Make_Millions_report.pdf https://www2.deloitte.com/content/dam/Deloitte/ie/Documents/... for more information on how cutting hairs on latency can dramatically affect an application's adoption rate